A new project for the summer

With traveling, I need a new project. When better to count cast-on stitches, but on a plane? Since I want to do this sweater in the round, front and back at the same time, I need lots of stitches, 328 of them. I mark them off by 40’s with safety pins. I get about half way and the inevitable pondering starts. Is my long tail long enough? I soon start over. But it really doesn’t matter. I have all summer.